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Date: Wed, 28 Jan 2015 09:59:05 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Re: Custom __set_thread_area for ARM
* Andy Lutomirski <luto@...capital.net> [2015-01-27 15:32:27 -0800]:
> Does musl not use inline asm? ISTM something like:
>
it is arch specific code, which is currently either
- in asm in src/DIR/ARCH/foo.s if there is appropriate src/DIR/foo.c
- in c in a header under arch/ARCH
- in c in arch/ARCH/src/foo.c
- in asm in arch/ARCH/src/ARCH/foo.s if there is appropriate foo.c
so under src/thread you cannot have arch specific c code
with the current makefile, it has to be asm there
> struct user_desc desc;
> memset(&desc, 0, sizeof(desc));
> desc.base = whatever;
> // assign other fields
> if (set_thread_area(&desc) != 0)
> handle error;
>
> asm volatile ("mov %0,%%fs" : : "=rm" ((desc.entry_number << 3) | 3));
>
> would be a lot more comprehensible.
>
> --Andy
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